176 lines
3.8 KiB
C
176 lines
3.8 KiB
C
/*
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* Copyright 2012 Red Hat, Inc <mjg@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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static struct acpi_table_bgrt *bgrt_tab;
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static struct kobject *bgrt_kobj;
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struct bmp_header {
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u16 id;
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u32 size;
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} __attribute ((packed));
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static struct bmp_header bmp_header;
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static ssize_t show_version(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->version);
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}
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static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
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static ssize_t show_status(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->status);
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}
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static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
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static ssize_t show_type(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_type);
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}
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static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
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static ssize_t show_xoffset(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_x);
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}
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static DEVICE_ATTR(xoffset, S_IRUGO, show_xoffset, NULL);
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static ssize_t show_yoffset(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", bgrt_tab->image_offset_y);
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}
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static DEVICE_ATTR(yoffset, S_IRUGO, show_yoffset, NULL);
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static ssize_t show_image(struct file *file, struct kobject *kobj,
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struct bin_attribute *attr, char *buf, loff_t off, size_t count)
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{
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int size = attr->size;
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void __iomem *image = attr->private;
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if (off >= size) {
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count = 0;
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} else {
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if (off + count > size)
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count = size - off;
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memcpy_fromio(buf, image+off, count);
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}
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return count;
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}
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static struct bin_attribute image_attr = {
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.attr = {
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.name = "image",
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.mode = S_IRUGO,
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},
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.read = show_image,
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};
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static struct attribute *bgrt_attributes[] = {
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&dev_attr_version.attr,
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&dev_attr_status.attr,
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&dev_attr_type.attr,
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&dev_attr_xoffset.attr,
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&dev_attr_yoffset.attr,
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NULL,
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};
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static struct attribute_group bgrt_attribute_group = {
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.attrs = bgrt_attributes,
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};
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static int __init bgrt_init(void)
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{
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acpi_status status;
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int ret;
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void __iomem *bgrt;
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if (acpi_disabled)
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return -ENODEV;
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status = acpi_get_table("BGRT", 0,
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(struct acpi_table_header **)&bgrt_tab);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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sysfs_bin_attr_init(&image_attr);
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bgrt = ioremap(bgrt_tab->image_address, sizeof(struct bmp_header));
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if (!bgrt) {
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ret = -EINVAL;
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goto out_err;
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}
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memcpy_fromio(&bmp_header, bgrt, sizeof(bmp_header));
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image_attr.size = bmp_header.size;
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iounmap(bgrt);
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image_attr.private = ioremap(bgrt_tab->image_address, image_attr.size);
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if (!image_attr.private) {
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ret = -EINVAL;
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goto out_err;
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}
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bgrt_kobj = kobject_create_and_add("bgrt", acpi_kobj);
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if (!bgrt_kobj) {
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ret = -EINVAL;
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goto out_iounmap;
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}
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ret = sysfs_create_group(bgrt_kobj, &bgrt_attribute_group);
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if (ret)
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goto out_kobject;
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ret = sysfs_create_bin_file(bgrt_kobj, &image_attr);
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if (ret)
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goto out_group;
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return 0;
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out_group:
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sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
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out_kobject:
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kobject_put(bgrt_kobj);
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out_iounmap:
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iounmap(image_attr.private);
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out_err:
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return ret;
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}
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static void __exit bgrt_exit(void)
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{
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iounmap(image_attr.private);
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sysfs_remove_group(bgrt_kobj, &bgrt_attribute_group);
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sysfs_remove_bin_file(bgrt_kobj, &image_attr);
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}
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module_init(bgrt_init);
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module_exit(bgrt_exit);
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MODULE_AUTHOR("Matthew Garrett");
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MODULE_DESCRIPTION("BGRT boot graphic support");
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MODULE_LICENSE("GPL");
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